$OpenBSD: patch-src_sha_c,v 1.2 2008/12/18 23:45:37 sthen Exp $
--- src/sha.c.orig	Thu Aug  2 11:45:10 2007
+++ src/sha.c	Thu Dec 18 23:04:16 2008
@@ -4,17 +4,14 @@
 ** modify it under the terms of GNU Lesser General Public License.
 */
 
+#include <sys/types.h>
+#include <sha1.h>
+
 #include "common.h"
 #include "iksemel.h"
 
-static void sha_buffer (iksha *sha, const unsigned char *data, int len);
-static void sha_calculate (iksha *sha);
-
 struct iksha_struct {
-	unsigned int hash[5];
-	unsigned int buf[80];
-	int blen;
-	unsigned int lenhi, lenlo;
+	SHA1_CTX context;
 };
 
 iksha *
@@ -32,51 +29,20 @@ void
 iks_sha_reset (iksha *sha)
 {
 	memset (sha, 0, sizeof (iksha));
-	sha->hash[0] = 0x67452301;
-	sha->hash[1] = 0xefcdab89;
-	sha->hash[2] = 0x98badcfe;
-	sha->hash[3] = 0x10325476;
-	sha->hash[4] = 0xc3d2e1f0;
+	SHA1Init(&sha->context);
 }
 
 void
 iks_sha_hash (iksha *sha, const unsigned char *data, size_t len, int finish)
 {
-	unsigned char pad[8];
-	unsigned char padc;
-
-	if (data && len != 0) sha_buffer (sha, data, len);
-	if (!finish) return;
-
-	pad[0] = (unsigned char)((sha->lenhi >> 24) & 0xff);
-	pad[1] = (unsigned char)((sha->lenhi >> 16) & 0xff);
-	pad[2] = (unsigned char)((sha->lenhi >> 8) & 0xff);
-	pad[3] = (unsigned char)(sha->lenhi & 0xff);
-	pad[4] = (unsigned char)((sha->lenlo >> 24) & 0xff);
-	pad[5] = (unsigned char)((sha->lenlo >> 16) & 0xff);
-	pad[6] = (unsigned char)((sha->lenlo >> 8) & 0xff);
-	pad[7] = (unsigned char)(sha->lenlo & 255);
-
-	padc = 0x80;
-	sha_buffer (sha, &padc, 1);
-
-	padc = 0x00;
-	while (sha->blen != 56)
-		sha_buffer (sha, &padc, 1);
-
-	sha_buffer (sha, pad, 8);
+	if (data && len != 0)
+		SHA1Update(&sha->context, data, len);
 }
 
 void
 iks_sha_print (iksha *sha, char *hash)
 {
-	int i;
-
-	for (i=0; i<5; i++)
-	{
-		sprintf (hash, "%08x", sha->hash[i]);
-		hash += 8;
-	}
+	SHA1End(&sha->context, hash);
 }
 
 void
@@ -91,62 +57,7 @@ iks_sha (const char *data, char *hash)
 	iksha *sha;
 
 	sha = iks_sha_new ();
-	iks_sha_hash (sha, (const unsigned char*)data, strlen (data), 1);
+	iks_sha_hash (sha, data, strlen (data), 1);
 	iks_sha_print (sha, hash);
 	iks_free (sha);
-}
-
-static void
-sha_buffer (iksha *sha, const unsigned char *data, int len)
-{
-	int i;
-
-	for (i=0; i<len; i++) {
-		sha->buf[sha->blen / 4] <<= 8;
-		sha->buf[sha->blen / 4] |= (unsigned int)data[i];
-		if ((++sha->blen) % 64 == 0) {
-			sha_calculate (sha);
-			sha->blen = 0;
-		}
-		sha->lenlo += 8;
-		sha->lenhi += (sha->lenlo < 8);
-	}
-}
-
-#define SRL(x,y) (((x) << (y)) | ((x) >> (32-(y))))
-#define SHA(a,b,f,c) \
-	for (i= (a) ; i<= (b) ; i++) { \
-		TMP = SRL(A,5) + ( (f) ) + E + sha->buf[i] + (c) ; \
-		E = D; \
-		D = C; \
-		C = SRL(B,30); \
-		B = A; \
-		A = TMP; \
-	}
-
-static void
-sha_calculate (iksha *sha)
-{
-	int i;
-	unsigned int A, B, C, D, E, TMP;
-
-	for (i=16; i<80; i++)
-		sha->buf[i] = SRL (sha->buf[i-3] ^ sha->buf[i-8] ^ sha->buf[i-14] ^ sha->buf[i-16], 1);
-
-	A = sha->hash[0];
-	B = sha->hash[1];
-	C = sha->hash[2];
-	D = sha->hash[3];
-	E = sha->hash[4];
-
-	SHA (0,  19, ((C^D)&B)^D,     0x5a827999);
-	SHA (20, 39, B^C^D,           0x6ed9eba1);
-	SHA (40, 59, (B&C)|(D&(B|C)), 0x8f1bbcdc);
-	SHA (60, 79, B^C^D,           0xca62c1d6);
-
-	sha->hash[0] += A;
-	sha->hash[1] += B;
-	sha->hash[2] += C;
-	sha->hash[3] += D;
-	sha->hash[4] += E;
 }
